Microwave ovens use various combination of electrical circuits and mechanical devices to produce and control an output of microwave energy for heating and cooking.
Generally speaking the systems of a microwave oven can be divided into two fundamental sections, the control section and the high-voltage section .
Control section
It consists of a: - Timer (electronic or electromechanical) - A system to control or govern the power output - Various interlock and protection devices. The components in the high-voltage section serve to step up the house voltage to high voltage. The high voltage is then converted microwave energy.
How it works?
Electricity from the wall outlet travels through the power cord and enters the microwave oven through a series of fuse and safety protection circuits.
These circuits include various fuses and thermal protectors that are designed to deactivate the oven in the event of an electrical short or overheating.
If all systems are normal, the electricity passes through to the interlock and timer circuits. When then oven door is closed, an electrical path is also established
through a series of safety interlock switches. Setting the oven timer and starting a cook operation extends this voltage path to the control circuits .
Generally, the control system includes either an electromechanical relay or an electronic switch called a triac.
Then the control circuit generates a signal that causes the relay or triac to activate, producing a voltage path to the high-voltage transformer .
By adjusting the on-off ratio of this activation signal, the control system can govern the application of voltage to the high-voltage transformer,
thereby controlling the on-off ratio of the magnetron tube and therefore the output power of the microwave oven.
The powerful voltage would then be dynamically convert the high voltage in to undulating waves of electromagnetic cooking energy through magnetron tube.
The microwave energy is transmitted into a metal channel called a waveguide , which feeds the energy into the cooking area where it encounters the slowly revolving metal blades of the stirrer blade . Some models use a type of rotating antenna while others rotate the food through the waves of energy on a revolving carousel.
Generally speaking the systems of a microwave oven can be divided into two fundamental sections, the control section and the high-voltage section .
Control section
It consists of a:
- Timer (electronic or electromechanical)
- A system to control or govern the power output
- Various interlock and protection devices.
The components in the high-voltage section serve to step up the house voltage to high voltage. The high voltage is then converted microwave energy.
How it works?
Electricity from the wall outlet travels through the power cord and enters the microwave oven through a series of fuse and safety protection circuits.
These circuits include various fuses and thermal protectors that are designed to deactivate the oven in the event of an electrical short or overheating.
If all systems are normal, the electricity passes through to the interlock and timer circuits. When then oven door is closed, an electrical path is also established
through a series of safety interlock switches. Setting the oven timer and starting a cook operation extends this voltage path to the control circuits .
Generally, the control system includes either an electromechanical relay or an electronic switch called a triac.
Then the control circuit generates a signal that causes the relay or triac to activate, producing a voltage path to the high-voltage transformer .
By adjusting the on-off ratio of this activation signal, the control system can govern the application of voltage to the high-voltage transformer,
thereby controlling the on-off ratio of the magnetron tube and therefore the output power of the microwave oven.
The powerful voltage would then be dynamically convert the high voltage in to undulating waves of electromagnetic cooking energy through magnetron tube.
The microwave energy is transmitted into a metal channel called a waveguide , which feeds the energy into the cooking area where it encounters the slowly revolving metal blades of the stirrer blade . Some models use a type of rotating antenna while others rotate the food through the waves of energy on a revolving carousel.